cp6.c 1.4 KB

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  1. /*
  2. * IOP Coprocessor-6 access handler
  3. * Copyright (c) 2006, Intel Corporation.
  4. *
  5. * This program is free software; you can redistribute it and/or modify it
  6. * under the terms and conditions of the GNU General Public License,
  7. * version 2, as published by the Free Software Foundation.
  8. *
  9. * This program is distributed in the hope it will be useful, but WITHOUT
  10. * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11. * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12. * more details.
  13. *
  14. * You should have received a copy of the GNU General Public License along with
  15. * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16. * Place - Suite 330, Boston, MA 02111-1307 USA.
  17. *
  18. */
  19. #include <linux/init.h>
  20. #include <asm/traps.h>
  21. static int cp6_trap(struct pt_regs *regs, unsigned int instr)
  22. {
  23. u32 temp;
  24. /* enable cp6 access */
  25. asm volatile (
  26. "mrc p15, 0, %0, c15, c1, 0\n\t"
  27. "orr %0, %0, #(1 << 6)\n\t"
  28. "mcr p15, 0, %0, c15, c1, 0\n\t"
  29. : "=r"(temp));
  30. return 0;
  31. }
  32. /* permit kernel space cp6 access
  33. * deny user space cp6 access
  34. */
  35. static struct undef_hook cp6_hook = {
  36. .instr_mask = 0x0f000ff0,
  37. .instr_val = 0x0e000610,
  38. .cpsr_mask = MODE_MASK,
  39. .cpsr_val = SVC_MODE,
  40. .fn = cp6_trap,
  41. };
  42. void __init iop_init_cp6_handler(void)
  43. {
  44. register_undef_hook(&cp6_hook);
  45. }